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Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Long-term debt, principally to banks and noteholders, consists of:
(in thousands, except interest rates)
March 31, 2021December 31, 2020
Revolving credit agreement with borrowings outstanding at an end of period interest rate of 3.56% in 2021 and 3.50% in 2020 (including the effect of interest rate hedging transactions, as described below), due in 2024
$384,000 $398,000 
Other debt, at an average end of period rate of 5.50% in both 2021 and 2020, due in varying amounts through 2021
2 
Long-term debt384,002 398,009 
Less: current portion
(2)(9)
Long-term debt, net of current portion$384,000 $398,000